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1
Heat 1/3 cup of the olive oil in a large enameled cast-iron casserole.
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2
Add the onions, prosciutto, shallots, thyme, garlic and bay leaves and cook over moderately low heat, stirring, until the onions begin to soften, about 5 minutes.
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3
Reduce the heat to low and cook until softened, about 12 minutes.
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4
Add the bell peppers and cook until softened, about 5 minutes.
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5
Add the eggplant and cook until softened, about 5 minutes.
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6
Add the zucchini and cook, stirring often, until softened, about 10 minutes.
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7
Add the wine and simmer over moderately high heat for 5 minutes.
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8
Add the tomatoes and simmer for 5 minutes longer, then add the V-8 juice and tomato paste.
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9
Simmer over moderate heat until thickened, about 15 minutes.
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10
Discard the thyme and bay leaves and season with salt and pepper.
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11
Preheat the oven to 425.
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12
Heat 2 large ovenproof skillets.
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13
Season the tuna steaks with salt and pepper.
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14
Add 2 tablespoons of the olive oil to each skillet.
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15
When the oil shimmers, add 2 tuna steaks to each skillet and cook over high heat until deeply browned on the bottom, about 4 minutes.
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16
Turn the steaks over and transfer the skillets to the oven.
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17
Roast for about 8 minutes, or until the tuna is pink inside.
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18
Transfer the tuna steaks to a carving board.
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19
Ladle the sauce onto 2 large platters.
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20
Slice the tuna across the grain 1/2 -inch thick.
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21
Arrange the tuna on the sauce, pour the pan juices over the tuna and serve very warm but not steaming hot.